Duplex steam pumping-engine.



No. 639,283. Patented De. l9, I899.

H. L. PERRINE.

DUPLEX STEAM PUMPING ENGINE.

I (Application filed Apr. 19, 1899.) 0 a 2 Sheets-8heet l.

THE NORRIS PETERS co. amoumm WASHINGTON u. c,

N0.'639,283. Patented nee. l9, I899.

. H. L. PERBINE.

DUPLEX STEAM PUMPING ENGINE.

(Application filed Apr. 19, 1899.) (No Model.) 2 SheetsSheet 2 ZZ g \ m: NORRIS PzTERs co. wow-unit) WASHINGTON, o. c.

I-IARMANUS LANSING PERRINE, OF MILXVAUKEE, V ISCON SIN.

DUPLEX STEAM PUMPING-ENGINE.

SFECIFIOATION forming part of Letters Patent No. 639,283, dated December 19, 1899- Application filed April 19, 1899.

Serial No. 713,664, (No model.)

To (0% whom it may concern:

Be it known that I, HARMANUS LANSING .PERRINE, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented a new and useful Improvement in Duplex Steam Pumping-Engines, of which the following is a specification.

I have designed certain improvements in what is known as cross-compound steam ends for air and Water pumps of the duplex type, and the particular improvement 'resides in certain parts and combinations of parts whereby a novel and advantageous operation of the engine is effected. Resulting from such operation and improvements the control of the steam end is rendered easy and steadyin the action of both engines, wherein the high and the low pressure pistons are caused to control to line and line the slide-valves of their respective cylinders, while both of said slidevalve are carried across the ports by a single chest or driving piston, which may be arranged on the high or on the low pressure cylinder, preferably on the low.

So far as I know and can find I am the first to design and operate a cross-compound steam end through one rock-shaft and chest or driving piston so that both main pistons move their respective slide-valves line to line, by direct connections to the valves,and the throw across the ports is completed by the action of a third piston acting through a lever and rock-shaft. This is the primary feature of my invention and involves two steam-cylinders side by side, cross-compound, with mechanism whereby each piston has direct control over its own slide-valve to line and line, and both valves carried across the ports to wide open bya single driving or chest piston.

In the accompanying drawings I have shown an engine embodying myinvention in the form at present preferred by me, The following is a description of the engine shown but it will be understood that various modifications and changes may be made without departing from the-spirit of my invention and without exceeding the scope of the claims.

Referring to the drawings, Figure 1 shows in side elevation the high-pressure cylinder partly in section and theslide-valve for controlling the inlet and exhaust ports of said as seen in Fig. 2.

cylinder. Fig. 2 is across-section on the line A B of Fig. 1 looking toward the water end of the pump and shows the rod connections of the slide-valves of both cylinders and of the ob est-piston of the low-pressure cylinder. Fig. 3 shows the low-pressu re cylinder, partly in section, the steam-chest, the slide-valve, and the chest-piston which by its connections, it will be understood, is the means whereby the slide-valves of both engines are carried across the ports. Fig. 4 shows in partial vertical transverse section the high-pressure and low-pressure cylinders and their cross-connectin g pipe or by-pass for the steam chests of the two cylinders; and Fig. 5 shows in face view the valve seat and its ports of the low-pressure cylinder-chest.

The cross-compound steam end is applicable to pumps for waterworks, condensers, vacuum-pumps, and air-pumps or air-compressors.

In Fig. 1 the piston of the high-pressure cylinder A is shown at the end of its inward stroke and the piston-rod connecting the water-cylinder. The steam-chest B communicates by ports in the usual manner with the cylinder A, and the slide-valve G connects by its stem 2" to the long end of lever D, which engages the cross-head b on the piston-rod, This sliding connection of the lever with the piston provides a movable connection to accommodate the are described by the vibratory movement of said lever. This lever D is f ulcru med to the pin 0 on the crank, which is fixed to and stands downward from a rock-shaft cl, the rocking of which is effected conjoiutly by its connection with the levers D, D, and F, as seen in Fig. 2. It will be understood that the high-pressure and low-pressure cylinders have identical valve-gear-supporting frames E, and it is upon bearings cl, d, fixed on the upper bars of these frames, that the rock-shaft cl is mounted across the frames. The upper end of the lever D extends above its fulcrum-pin c and connects and actuates the slide-valve 0, so that this lever is movable on its fulcrum below its connection with the slide-valve and below its connection with the rock-shaft d. This relation of the leverD to the crankarm 0 is important in its relation to the connection of the crank-arm with the auxiliary or chest piston of the low-pressure cylinder, as I shall more particularly presently state.

At the low-pressure-cylinder side A the rock-shaft d has keyed to it a short lever F, which stands upward and is connected at its upper end by link f and rod f to the auxiliary or chest piston G of the low-pressure cylinder. To this lever F and between its connection with the rock-shaft and the chestpiston is fulcrumed on a pin 6 the lever D, that is connected at its lower end to a sliding bearing b seated on the frame of the lowpressure cylinder in a manner identical with the lever D of the high-pressure cylinder. At its upper end this lever F is connected by a link g'and stem g to and actuates the chest slide-valve H of the low-pressure cylinder A to line and line, and this conuection,as shown in Figs. 2 and 3, is important in its relation to the downward-standing crank c, as I shall presently state. A port h at each side of the induction-port h in the seat of the chest slidevalve H admits steam to the chest G of the chestpiston G, and steam admitted to its chest from the high-pressu re cylinder actuates said chest-piston and through it the lever F. The piston of the high-pressure cylinder having finished its stroke to the right has brought its connected valve to line and line, as shown in Fig. 1. The auxiliary slide-valve Hin the lowpressure steam-chest having a slight lead is' admitting steam to the chest of the chestpiston G by the small port It, and the said valve G.is thereby caused to move the lever F to the right, while the crank c by its pivotal connections is moved to the left, carrying with it the lever D, and through its con necting-link 2' moves the slide-valve O to the left to wide-open port, reversing the stroke and exhausting into the low-pressure steamchest and cylinder through the cross or pass over pipe I. (See Fig. 4.) By this arrange ment the two pistons pass each other in the center of the stroke and in opposite directions.

The lever F and the crank c stand in reverse direction, so as to give the opposite directions to the piston in passing the center.

It will be readily understood that by the arrangement of valve-gear the chest-piston aotuates the slide -valve of the highpressure cylinder and at the same time controls the slide-valve of the low-pressure cylinder, while each cylinder-piston controls its own slide-valve to line and line, and that the said slide-valves of each cylinder move to wideopen ports by the action of the one auxiliary steam-chest piston that is controlled by the main lever of one of the steam-cylinders.

Referring to the functions of the lever D, connecting the piston-rod of the high-pressure cylinder, and of the lever F, connecting the auXiliarychest-piston of the low-pressure cylinder, it will be noticed that the connections of said levers are such as to cause them to move together-in the same direction with each movement of the piston-rod to which the lever D is connected, while the connections of the lever D with the lever F and the slide-valve of the low-pressure cylinder are such as to cause the said lever D to move in, a reverse direction to the lever D to produce the operations stated.

In Fig. 4, 1 indicates the steam-supply port of the pass-over pipe for the low-pressure slide-valve and B the exhaust, while in Fig. 1, B indicates the exhaust for the high-pressure-cylinder slide-valve.

It is obvious that the chest driving-piston need not be confined in its location to the low-pressure steam-chest, as it may be arranged upon and actuated by steam from the high-pressure chest; but Ipreferthe arrangement shown.

As a means of starting the engine a bypass connection may be made to the passover pipe for admitting live steam to the lowpressure cylinder.

I claim- 1. In a crosscompound direct-acting steam pumping -engine, and in combination with high and low pressure steam-cylinders side by side, their pistons and slide-valves, a drivin g chest-piston on the low-pressure cylinder in direct communication with an auxiliary slide-valve controlled by the low-pressure piston, the pistons, and slide-valves of both cylinders and the driving chest-piston connect- .ed by means of a rock-shaft having an arm at each end, a lever connecting each arm, the piston-rod of each cylinder and the slidevalve of each cylinder, one of said arms connecting said driving chest-piston, whereby to cause the latter to be actuated by the exhaust-steam from the high-pressure cylinder, to carry the slide -valves of each cylinder across the ports to wide open, and each cylinder-piston to have direct control over its own slide-valve.

2. In cross-compound steam pumping-engines, and in combination with high and low pressure cylinders, their pistons, and slidevalves, of valve-actuating gear consisting of the lever D connected to the piston and slide valve of the high-pressure cylinder, the rockshaft (Z having the downward-standin g crankarm a, on the pin 0 of which said leveris fulcrumed, the upward-standing lever F on the said rock-shaft, the auxiliary piston connecting the upper end of said lever F, and the lever D connected by its long end to the cross-head of the piston-rod of the low-pressure cylinder, and fulcru med on said lever F between its rock-shaft and its connection with the auxiliary piston, whereby the slide-valves are controlled to line and line, and moved to wide-open ports, in the way described.

3. In a crosscompound steam pumping-engine, and in combination with high and low pressure cylinders, their pistons and slidevalves, of the lever D connecting the piston and slid e-valve of the high-pressure cylinder, the lever D connecting the piston and slidevalve of the low-pressure cylinder, the auxiliary piston of the latter, the transverse rockshaft, having the crank-arm c at one end connecting the lever D and the lever F on the other rock-shaft end, connecting the auxiliary piston, and the lever D, arranged to operate substantially as described.

4. The combination in a cross-compound direct steam pumping-engine, the high and low pressure cylinders side by side, their pistons and slide-valves, the transverse rock-shaft (1 having the crank-arm c on one end and the lever F on the other and standing in reverse vertical direction, the lever D pivotally connecting the said crank-arm and the piston cross-head of the high-pressure cylinder, the lever D pivotally connecting the piston crosshead and the slide-valve of the low-pressure cylinder and mediately connecting the said lever F of the driving or chest piston for operation in the way described.

5. The combination of the high and low pressure cylinders side by side, their pistons and slide-valves, with the rock-shaft having the crank-arm c, the lever D connecting the said crank-arm, the slide-valve and pistonrod of the high-pressure cylinder, the lever F on the rock-shaft connecting the auxiliary piston, and the lever D connecting said lever F and the piston-rod of the low-pressure cylinder, the said valve-gear connections being disposed and actuated to cause one engine to operate its own valve and the valves of the other engine;

6. In combination in a cross-compound di rect steam pumping-engine, the high and low pressure cylinders side by side, the levers D,

D connecting the pistons of said cylinders,-

the transverse rock-shaft having on one end the hanging crank-arm 0 connecting the lever D and on the other end the lever F connecting mediately of its length with the lever D whereby the said pistons are caused to control its own slide-valve, and the driving or chest piston connecting the lever F whereby the slide-valve of each cylinder is caused to be moved to wide-open ports.

7. In a duplex steam pumping-engine and in combination with high and low pressure cylinders, their pistons and slide-valves, and valve-gear arranged and connecting said slidevalves whereby one engine is caused to actuate its own slide-valve and the slide-valve of the other engine, of the auxiliary piston having direct connection with the slide-valve of the low-pressure cylinder through lever F, and connected to and actuated by said gear, whereby said auxiliary piston is actuated to cause the slide-valves of both cylinders to be carried across their ports.

In testimony whereof I hereunto sign this specification.

IIARMANUS LANSING PEHRINE.

In presence of-- A. G. WEISSERT, HOWARD A. CLEAVER. 

